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IOOLFOR MAKING LOCK MORTISBS. No. 307,848. Patented Nov. 11, 1884.

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SIMEON \V. DRONVNE AND DANIEL K. HUBBARD, OF NORIVIOH, CONN.

TOOL FOR MAKING LOCK- MORTISES.

SPECIFICATION forming part of Letters Patent Nof 807,848, dated November I1, 1884:.

Application filed September 20, 1884. (No model.)

To a whom it may concern.-

Be it known that we, SIMEON IV. DROWNE, and DANIEL K. HUBBARD, both of the city of Norwich, county of New London,and State of Connecticut, have invented a certain new and useful Improvement in Tools for Mortising for Locks, &c., which improvement is fully set forth and described in the following specification, reference being had to the drawings which form a part of and accompany said specification.

Our invention relates to an improved device to facilitate the boring and mortising of doors to receive the so-callec mortise-locks, our immediate object being to provide at a moderate cost aportable device which may be readily attached to doors of various thicknesses, and which shall serve as a guide while boring, as hereinafter more fully described.

In the accompanying drawings, Figure l is a perspective view of our device, the guide for boring the knob-spindle hole being removed. Fig. 2 is a side View of the same with said spindle-hole guide attached. Fig. 3 is a cross-section on line 00 m, Fig. 2.

In boring a series of holes preparatory to cutting out a mortise much trouble is often experienced in getting the several holes in line each with the others, there being a tendency on the part of the bit to draw in or run as it enters the wood, and as said bit is quite likely to run in a half-dozen directions in boring as many holes it is next to impossible in cutting out the mortise to make it a satisfactory job. Much time is also spent in laying out the work to be done, or, in other words, in determining where to bore. These difficulties our invention is intended to overcome.

Inthe annexed drawings, the letter A represents a metallic bar recessed on its rear side, as in Fig. 3, and provided with alongitudinal slot, B. At each end is secured an adjustable clamping device consistingof the clamp-bar O, screw cl, and washer e, by means of which the complete tool may be secured to the edge of a door. These clamp-bars may be formed as a rigid part of bar A; but we prefer to hinge them to said bar, as shown, as we find it much more convenient to pack and ship them when so constructed.

Fitted movablyon bar A is a metallic slide,

screw, 12, which engages a nut arranged to travel in the recessed rear side of bar A.

The upper face or edge of bar A is provided with a series of transverse marks, 0, or otherwise similarly graduated to correspond with the diameter of the bit to be used, so that after having bored a hole the slide E may be moved one or more marks; as desired, and again secured in place before boring the next hole of the series.

On the back or lower side of bar A is an extension, I, formed, preferably, as an integral part of said bar, to receive and support the bit-guide K,which is held in place on extension I by a thumb-screw, h. Said bit-guide K is arranged to swing on its pivotal screw, and is also adjustable longitudinally to bore the knobspindle hole for locks of different sizes, as hereinafter described.

Our complete device is used as follows: It is first secured to the edge of the door by means of the clamping-screws d. The bit-guide a is then so adjusted that its center is directly over the longitudinal center of said door. The slide E is then adjusted on bar A until it is brought over the spot where the first of the series of holes is to be bored. After having bored to the desired depth the bit is removed and the slide E is dropped one mark on the graduated scale, bringing the guide a over the place to be next bored. This operation is repeated until holes enough have been bored to cover the length of the desired mortise. The guide a, being but a little larger than the bit used,tends to hold said bit in a given position and to prevent its running, as above referred to. In boring for the knob-spindle the center of the hole to be bored is ascertained and the guide K brought immediately over it and fastened rigidly by screw h. A hole of the proper size may now be bored through the door and at a right angle with the lock-mortise.

It will be evident that in a new house where the locks or knob-latches on the several doors are of the same size the guide K need be adj usted but once.

Having thus described our invention, we

' claim- 5 1. In combination with the bar A, recessed on itsrear side and slotted longitudinally, as described, the clamp-bar C, pivotally attached to each end of said bar A, and having the thumb-screws d and washers e', the slide E, 1on- 0 gitudinally adjustable on bar A, and having transversely adjustable on its outer side the bit-guide a, the bar A being graduated to correspond with the diameter of the bit used, all substantially as and for the purpose specified. 

